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Cheap flights from Ottawa to Illinois from C$ 200

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 18/10. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — ORD
11 Oct — 18 Oct1
1 adult
1 adult, Economy

Cheap flight deals from Ottawa to Illinois

Keep the following information in mind while searching for Ottawa to Illinois flight deals. Data was last updated 11 September 2025.

Round-trip from

C$ 453

One-way from

C$ 200

Popular in

November

Cheapest in

May

Average price

C$ 546

Good round-trip deal

C$ 615 or less

Good one-way deal

C$ 321 or less
United Airlines
  • United Airlines
  • 25/9-29/9
  • Nonstop
  • 4h 41m total
  • Ottawa to Illinois
Search Deals
WestJet
  • WestJet
  • 18/10
  • 1 total stop
  • 11h 43m total
  • Ottawa to Illinois
Search Deals
Highest demand for flights based on searches. 7% potential increase in price (C$ 60 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 11 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in September 2025
Search Deals
Price to beat on a round-trip flight from Ottawa to Illinois.
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Price to beat on a one-way flight from Ottawa to Illinois.
Search Deals

Find flight deals from Ottawa to Illinois

Cheapest flights from Ottawa to Illinois
Explore the most affordable flight options available from Ottawa to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 11 September 2025.

Thu 25/96:33 a.m.YOW - ORD
Nonstop2h 27mUnited Airlines
Mon 29/910:50 a.m.ORD - YOW
Nonstop2h 14mUnited Airlines
Deal found 10/9C$ 453
Sun 19/103:50 p.m.YOW - ORD
1 stop20h 00mMultiple Airlines
Mon 27/108:15 a.m.ORD - YOW
2 stops15h 27mMultiple Airlines
Deal found 9/9C$ 459
Thu 25/96:33 a.m.YOW - ORD
Nonstop2h 27mUnited Airlines
Wed 8/108:50 a.m.ORD - YOW
1 stop4h 23mUnited Airlines
Deal found 10/9C$ 460
Sat 27/95:25 p.m.YOW - ORD
Nonstop2h 29mLufthansa
Mon 29/910:50 a.m.ORD - YOW
Nonstop2h 14mLufthansa
Deal found 11/9C$ 470
Sat 27/95:25 p.m.YOW - ORD
Nonstop2h 29mMultiple Airlines
Mon 29/910:40 a.m.ORD - YOW
1 stop5h 39mMultiple Airlines
Deal found 11/9C$ 473
Wed 24/95:25 p.m.YOW - ORD
Nonstop2h 29mUnited Airlines
Sat 27/910:45 a.m.ORD - YOW
1 stop7h 07mUnited Airlines
Deal found 10/9C$ 474
Sat 4/1010:45 a.m.YOW - ORD
2 stops12h 26mMultiple Airlines
Tue 7/106:58 p.m.ORD - YOW
1 stop20h 59mMultiple Airlines
Deal found 11/9C$ 477
Sat 27/98:35 a.m.YOW - ORD
1 stop5h 39mAir Canada
Mon 29/98:25 p.m.ORD - YOW
1 stop4h 09mAir Canada
Deal found 10/9C$ 478
Fri 26/95:50 p.m.YOW - ORD
1 stop6h 40mUnited Airlines
Tue 30/96:06 p.m.ORD - YOW
Nonstop2h 29mUnited Airlines
Deal found 11/9C$ 479
Fri 7/119:30 a.m.YOW - MDW
1 stop13h 50mMultiple Airlines
Mon 10/118:00 a.m.MDW - YOW
1 stop14h 58mMultiple Airlines
Deal found 11/9C$ 482
Tue 7/103:50 p.m.YOW - ORD
1 stop8h 55mMultiple Airlines
Thu 9/101:26 p.m.ORD - YOW
2 stops9h 56mMultiple Airlines
Deal found 11/9C$ 484
Sat 4/104:25 p.m.YOW - MDW
1 stop17h 53mMultiple Airlines
Tue 7/109:35 a.m.MDW - YOW
1 stop7h 34mMultiple Airlines
Deal found 11/9C$ 491

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ottawa to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 11 September 2025.
Use the filters below to find and compare flights from Ottawa to Illinois that are best for you.

Fly from

Ottawa

Fly to

Illinois

Route

Depart

Return

Price

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Thu 25/9

6:33 a.m.-8:00 a.m.

Nonstop2h 27m

Chicago O'Hare Intl

Mon 29/9

10:50 a.m.-2:04 p.m.

Nonstop2h 14m

C$ 453

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Thu 25/9

6:33 a.m.-8:00 a.m.

Nonstop2h 27m

Chicago O'Hare Intl

Wed 8/10

8:50 a.m.-2:13 p.m.

1 stop4h 23m

C$ 460

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Fri 3/10

6:33 a.m.-8:00 a.m.

Nonstop2h 27m

Chicago O'Hare Intl

Sun 5/10

9:20 p.m.-9:58 a.m.

1 stop11h 38m

C$ 473

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Sat 4/10

5:25 p.m.-6:54 p.m.

Nonstop2h 29m

Chicago O'Hare Intl

Tue 7/10

9:20 p.m.-9:58 a.m.

1 stop11h 38m

C$ 473

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Tue 7/10

6:33 a.m.-8:00 a.m.

Nonstop2h 27m

Chicago O'Hare Intl

Thu 9/10

6:00 a.m.-11:45 a.m.

1 stop4h 45m

C$ 473

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Wed 24/9

6:33 a.m.-8:00 a.m.

Nonstop2h 27m

Chicago O'Hare Intl

Sat 27/9

10:45 a.m.-6:52 p.m.

1 stop7h 07m

C$ 474

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Fri 3/10

6:33 a.m.-8:00 a.m.

Nonstop2h 27m

Chicago O'Hare Intl

Mon 6/10

9:20 p.m.-9:58 a.m.

1 stop11h 38m

C$ 474

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Thu 25/9

8:35 a.m.-1:13 p.m.

1 stop5h 38m

Chicago O'Hare Intl

Wed 8/10

9:55 a.m.-5:04 p.m.

1 stop6h 09m

C$ 479

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Fri 26/9

5:50 p.m.-11:30 p.m.

1 stop6h 40m

Chicago O'Hare Intl

Tue 30/9

6:06 p.m.-9:35 p.m.

Nonstop2h 29m

C$ 479

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Sat 4/10

4:25 p.m.-9:18 a.m.

1 stop17h 53m

Chicago Midway

Tue 7/10

9:35 a.m.-6:09 p.m.

1 stop7h 34m

C$ 491

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/9

Showing 1-10 of 41 results
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Best time to book a flight from Ottawa to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Ottawa with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ottawa to Illinois

What is the cheapest month to book a flight from Ottawa to Illinois?

Currently, January is the cheapest month in which you can book a flight from Ottawa to Illinois (average of C$ 261). Flying from Ottawa to Illinois in March is currently the most expensive (average of C$ 349). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from YOW to IL?

Find hourly flight availability from Ottawa to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 11 September 2025.

When flying from Ottawa to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Ottawa to Illinois

Explore weekly flight availability from Ottawa to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 11 September 2025.

The most flights from YOW to USIL are scheduled on a Wednesday (12 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (11 on average).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated 11 September 2025.
Read reviews from past customers who have flown Porter Airlines,United Airlines, andAir Canada from Ottawa to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
7.9
Good
363 reviews
Check prices

Entertainment

7.0

Food

7.6

Overall

7.9

Comfort

7.9

Boarding

8.1

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Porter Airlines
7.9
Good
363 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Entertainment

7.0

Food

7.6

Overall

7.9

Comfort

7.9

Boarding

8.1

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
United Airlines
7.4
Good
8,937 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Entertainment

7.0

Food

7.6

Overall

7.9

Comfort

7.9

Boarding

8.1

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.
Air Canada
7.1
Good
10,000 reviews
Porter Airlines
7.9
Good
363 reviews
Check prices

Entertainment

7.0

Food

7.6

Overall

7.9

Comfort

7.9

Boarding

8.1

Crew

8.6

Reviews

1 / 20
2.0
Mediocre

Anonymous,Sep 2025

YYZ - OPO

Very disappointing, booked with Porter airlines and changed to Air Transit last minute. Old plane, cramped seating, even the aisle was the narrowest I’ve ever seen. Very uncomfortable flight. Full meal at 130 am and only a small piece of banana bread in the morning… should be opposite.

Related info for your journey

Find useful and relevant information for your journey from Ottawa to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ottawa to Illinois?

    Ottawa (YOW) is the airport you will fly out of if you book a flight from Ottawa to Illinois. It is only a 10.6 km journey to Ottawa (YOW) from Ottawa’s city centre.

  • How long is the flight from Ottawa to Illinois?

    United Airlines and Air Canada can get you from Ottawa to Illinois in just under 2h 27m. Your travel time can differ by up to 1h 56m. There are 1051 km between Ottawa and Illinois. When browsing for deals, the options you’ll see will be for both direct flights and flights with stops.

  • What are the most popular routes from Ottawa to Illinois?

    Most travellers choose Ottawa - Chicago O'Hare Intl, Ottawa - Chicago Midway or Ottawa - Lambert-St Louis when deciding on the best route from Ottawa to Illinois.

  • What are the most reliable airlines from Ottawa to Illinois?

    Before booking your flight to Illinois from Ottawa, check out the most reliable airlines to get you to your destination on time: Avianca (89%), ANA (84%), GoJet( 80%).

  • What are the cheapest flights from Ottawa to Illinois?

    Looking for the cheapest flight from Ottawa to Illinois? While on average our users pay C$ 1,449, our data indicates the cheapest price to be C$ 266. The most popular route (Ottawa - Chicago O'Hare Intl), is priced around C$ 406.

  • Can I find deals for flights from Ottawa to Illinois that include hotel bookings?

    Yes. In addition to deals on Ottawa to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ottawa to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ottawa to Illinois.

  • Can I find deals for business class flights from Ottawa to Illinois?

    Yes. Cheapflights offers flight deals from Ottawa to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ottawa to Illinois?

    Currently, January is the cheapest month in which you can book a flight from Ottawa to Illinois (average of C$ 261). Flying from Ottawa to Illinois in March is currently the most expensive (average of C$ 349). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Ottawa to Illinois

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Top 3 airlines flying from Ottawa to Illinois

Discover the top 3 airlines that operate flights from Ottawa to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 11 September 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 372AverageC$ 503FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
United AirlinesCheapestC$ 466AverageC$ 689FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 505AverageC$ 652FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Ottawa to Illinois?

Cheapflights makes it easy to find Ottawa to Illinois flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Ottawa to Illinois?

Cheapflights helps you find that perfect flight to Illinois from Ottawa by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Ottawa to Illinois with no change fees?

Yes! Cheapflights helps users easily find flights from Ottawa to Illinois with no change fees.

Can Cheapflights notify me if prices for flights from Ottawa to Illinois become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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